Table 1.
Linear broken-line regression equations based on monthly averaged body weight (see Table S1), (A) according to sex and body condition score (BCS) at 8 months, (B) for males according to maternal phenotype, (C) for females according to maternal phenotype (see Figure 1 for graphical depiction).
| Regression Model | Parameter Estimates | p Values | R2 | |
|---|---|---|---|---|
| A | ||||
| O males | Y = −134.07 + b1x for x ≤ XB | XB, 7.40 ± 0.35 | <0.01 | 0.99 |
| * Y = 6722.70 + b2x for x > XB | YB, 5444.32 ± 214.44 | <0.01 | ||
| b1, 753.47 ± 43.30 | <0.01 | |||
| * b2, −172.67 ± 87.68 | 0.07 | |||
| L males | Y = −64.66 + b1x for x ≤ XB | XB, 7.44 ± 0.17 | <0.01 | 1.00 |
| Y = YB for x > XB | YB, 4740.02 ± 88.98 | <0.01 | ||
| b1, 645.86 ± 15.77 | <0.01 | |||
| O females | Y = −64.66 + b1x for x ≤ XB | XB, 6.53 ± 0.49 | <0.01 | 1.00 |
| Y = YB for x > XB | YB, 3685.44 ± 199.75 | <0.01 | ||
| b1, 560.00 ± 46.43 | <0.01 | |||
| L females | Y = 29.76 + b1x for x ≤ XB | XB, 5.71 ± 0.51 | <0.01 | 0.99 |
| Y = YB for x > XB | YB, 3077.78 ± 173.91 | <0.01 | ||
| b1, 537.60 ± 55.17 | <0.01 | |||
| B | ||||
| OM males | Y = −140.98 + b1x for x ≤ XB | XB, 7.44 ± 0.18 | <0.01 | 1.00 |
| Y = 5979.85 + b2x for x > XB | YB, 5264.98 ± 104.83 | <0.01 | ||
| b1, 726.95 ± 19.68 | <0.01 | |||
| b2, −96.13 ± 40.34 | 0.03 | |||
| VM males | Y = −99.35 + b1x for x ≤ XB | XB, 7.40 ± 0.39 | <0.01 | 0.99 |
| Y = 6551.24 + b2x for x > XB | YB, 4955.41 ± 219.05 | <0.01 | ||
| b1, 682.91 ± 46.68 | <0.01 | |||
| b2, −215.60 ± 94.50 | 0.04 | |||
| LM males | Y = −56.36 + b1x for x ≤ XB | XB, 7.44 ± 0.17 | <0.01 | 1.00 |
| Y = YB for x > XB | YB, 4866.72 ± 87.88 | <0.01 | ||
| b1, 662.06 ± 15.55 | <0.01 | |||
| C | ||||
| OM females | Y = 11.71 + b1x for x ≤ XB | XB, 6.22 ± 0.49 | <0.01 | 1.00 |
| Y = YB for x > XB | YB, 3713.65 ± 227.96 | <0.01 | ||
| b1, 595.10 ± 50.65 | <0.01 | |||
| VM females | Y = 138.10 + b1x for x ≤ XB | XB, 7.30 ± 0.27 | <0.01 | 0.99 |
| Y = 4126.60 + b2x for x > XB | YB, 3483.33 ± 103.35 | <0.01 | ||
| b1, 458.15 ± 19.55 | <0.01 | |||
| b2, −88.10 ± 40.07 | 0.05 | |||
| LM females | Y = 9.52 + b1x for x ≤ XB | XB, 5.72 ± 0.54 | <0.01 | 1.00 |
| Y = 2590.93 + b2x for x > XB | YB, 3075.42 ± 182.50 | <0.01 | ||
| b1, 535.81 ± 56.21 | <0.01 | |||
| b2, 84.67 ± 39.93 | 0.05 |
* Equation based on trend, p value not significant. O = kitten BCS ≥ 6 at 8 months, L = kitten BCS < 6 at 8 months, OM = maternal BCS always ≥ 6, VM = maternal BCS differing between < and ≥ 6, LM = maternal BCS always < 6. XB = age (months) at the breakpoint (BP), YB = weight (g) at the breakpoint (BP), b1 = slope prior to BP, b2 = slope after BP. p < 0.05 was considered significant.